Some SIP devices have more than one LAN port and/or PHONE port available.

For the hardware connections from your SIP device look at the above information and your user manual.
After connecting the hardware you have to make sure that your software is installed and configured the right way.

Software configuration

General

SIP port : 5060

Registrar : sip.call2india.com

Proxy server : sip.call2india.com

Outbound proxy server : leave empty

Account name : your Call2India username

Password : your Call2India password

Display name/number : your Call2India username or voipnumber

Stunserver (option) : stun.call2india.com

Below are some examples of the software configuration of various popular SIP devices. Please also consult the manual that came with your SIP device

Codecs

G.711 (64 kbps)

G.726 (32 kbps)

G.729 (8 kbps)

G.723 (5.3 & 6.3 kbps)

GSMFR (13.2 kbps)

If you have audio problems:
Use a STUN server (e.g. stun.call2india.com) with port 3478 (if supported by your device)
Use the G.711 codec